Cathode-ray tube with radiation-emitting index strip-like areas

Claim 2

A cathode-ray tube including a target structure and means for projecting an electron beam toward said target structure; said target structure comprising a viewing screen including a periodic series of color groups of parallel light-emitting color phosphor strips and an indexing means comprising a plurality of indexing strip-like areas of radiation-emissive indexing material and spaces therebetween, the color phosphor strips of each color group being adapted to emit different colors of light when scanned by said beam, and said strip-like areas having a response to the impingement of an electron beam different from said spaces, said strip-like areas, said spaces and said color phosphor strips being mutually parallel, one of said strip-like areas and said spaces being of substantially equal widths and the otheR of said strip-like areas and said spaces being alternately of two different widths, the average of said two different widths being substantially equal to said equal width, and the width of two consecutive strip-like areas and two spaces being equal to the width of six consecutive color groups.

Claim 3

The cathode-ray tube defined in claim 1, wherein said indexing strip-like areas have the same width, and said spaces therebetween alternate between two different widths.

Claim 4

The cathode-ray tube defined in claim 1, wherein said indexing strip-like areas alternate between two different widths and said spaces therebetween have the same width.

Claim 5

The cathode-ray tube defined in claim 1, wherein said indexing strip-like areas are strips of luminescent indexing material of a single uniform thickness.

Claim 6

The cathode-ray tube defined in claim 1, wherein said indexing means comprises a layer of emissive indexing material over said viewing screen and parallel strips of opaque material and spaces therebetween over said layer, said spaced opaque strips defining said indexing strip-like areas.

Claim 7

The cathode-ray tube defined in claim 1, wherein said equal widths are about a distance D and two different widths alternate between about D plus D/6 and about D minus D/6, where 4D is the indexing pitch of said indexing means.

Claim 8

A sensing-type color television picture tube comprising a target structure including a viewing screen and an electron-gun means for projecting an electron beam toward said target structure; said target structure comprising a. a periodic first series of color groups, each color group comprising three color phosphor strips, the three color phosphor strips of each color group being of different materials which emit in three different colors of light when scanned by said beam; b. a light-reflective layer on said color phosphor strips, and c. a periodic second series of indexing groups on said light-reflective layer, each indexing group comprising two spaced strip-like areas of luminescent indexing material adapted to produce indexing signals when scanned by said beam, said indexing strip-like areas extending parallel to said color phosphor strips; the width of an indexing group being equal to the width of six consecutive color groups, said indexing strip-like areas and the spaces therebetween having respective width dimensions, alternate ones of said width dimensions being of equal value, each value greater than the width of one color group, and the other width dimensions alternating between two different values, each of said different values being greater than the width of one color group.

Claim 9

A sensing-type color television picture tube comprising a target structure including a viewing screen and an electron-gun means for projecting an electron beam toward said target structure; said target structure comprising a. a periodic first series of color groups, each color group comprising three color phosphor strips, the three color phosphor strips of each color group being of different materials which emit in three different colors of light when scanned by said beam; b. a light-reflective layer on said color phosphor strips, and c. a periodic second series of indexing groups on said light-reflective layer, each indexing group comprising two spaced strip-like areas of luminescent indexing material adapted to produce indexing signals when scanned by said beam, said indexing strip-like areas extending parallel to said color phosphor strips; the width of an indexing group being equal to the width of six consecutive color groups, said indexing strip-like areas and the spaces therebetween having respective width dimensions, alternate ones of said width dimensions being of equal value, each value greater than the width of one color group, and the other width dimensions alternating between two different values, each of said different values being greater than the width of one color group.

Claim 10

The color picture tube defined in claim 7, wherein said other width dimensions alternate between D plus D/6 and D minus D/6, where 4D is the pitch of said periodic series of spaced strip-like areas.

Claim 11

The color picture tube defined in claim 8, wherein the difference between said two different values is one twelfth the sum of the indexing pitch of said indexing means.